Table 32.
Characteristics of a pruned Douglas tree compared with a Douglas control tree grown in the same area, in the Eastern part of France. Trees diameter at 1.30 m height was 30 cm. Measurements in green conditions on logs from fallen trees. Ultrasonic frequency 80 kHz [71].
| Tree type | Velocity along R axis (m/s) |
Velocity along L axis (m/s) |
||
|---|---|---|---|---|
| (bulk waves) |
(surface waves) |
|||
| Mean | Range | Mean | Range | |
| Pruned tree at 1.30 m, – density 547 kg/m3 | 1589 | 1545–1607 | 6006 | 5720–6424 |
| Pruned tree from 0.2 to 8.5 m | 1491 | 1259–1852 | 5916 | 5526–6523 |
| Control tree at 1.30 m – density 548 kg/m3 | 1272 | 1240–1304 | 5528 | 4515–5699 |
| Control tree from 0.2 m to 8.50 m | 1480 | 1273–1789 n | 5448 | 4040–6785 |
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